Radiographic TechniqueCâu 54 / 100
Which darkroom test verifies that the safelight is not fogging film?
a.Exposing a stepwedge and comparing densities
b.Placing a thermometer in the developer for five minutes
c.The coin test, in which a coin is placed on an unwrapped film under the safelight before processing
d.Running a cleaning film through the automatic processor
Giải thích
In the coin test an unwrapped film is left under the safelight with a coin on it for a few minutes; if the coin's outline is visible after processing, the safelight is fogging the film and the bulb, filter, or distance must be corrected. The stepwedge test monitors solution activity rather than safelight integrity. Checking developer temperature and running a cleaning film address processing quality, not light leakage.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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